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Assembly of Nucleosomal Arrays from Recombinant Core Histones and Nucleosome Positioning DNA
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Orchestrating the Specific Assembly of Centromeric Nucleosomes.

Ewelina Zasadzińska1, Daniel R Foltz2,3,4

  • 1Department of Biochemistry and Molecular Genetics, University of Virginia, Charlottesville, VA, 22908, USA.

Progress in Molecular and Subcellular Biology
|August 26, 2017
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Centromere Protein A (CENP-A) nucleosome assembly is crucial for epigenetic inheritance and genomic stability. This review details how new CENP-A is deposited at existing centromeres, ensuring proper chromosome segregation.

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Area of Science:

  • Epigenetics
  • Molecular Biology
  • Cell Biology

Background:

  • Centromeres are epigenetically defined chromosomal regions essential for accurate chromosome segregation during cell division.
  • Centromere identity is maintained by the incorporation of the histone H3 variant, Centromere Protein A (CENP-A), into centromeric nucleosomes.
  • The precise assembly and propagation of CENP-A nucleosomes are critical for genomic stability and the recruitment of kinetochore proteins.

Purpose of the Study:

  • To review the current understanding of CENP-A nucleosome assembly at centromeres.
  • To elucidate the mechanisms controlling CENP-A deposition and epigenetic inheritance.
  • To highlight the factors ensuring centromere identity maintenance across cell cycles.

Main Methods:

  • Literature review of studies on CENP-A nucleosome assembly and regulation.
  • Analysis of conserved and species-specific mechanisms governing CENP-A deposition.
  • Integration of knowledge on the roles of chaperones and chromatin complexes.

Main Results:

  • CENP-A deposition is tightly regulated, occurring specifically in early G1 into pre-existing centromeric chromatin.
  • The Mis18 complex and HJURP chaperone are essential for coupling new CENP-A deposition to established centromere sites.
  • Various chromatin-associated complexes modulate CENP-A nucleosome stability and deposition.

Conclusions:

  • The selective assembly of CENP-A nucleosomes at existing centromeres ensures epigenetic inheritance and centromere identity.
  • Understanding these mechanisms is vital for comprehending genomic stability and cell division fidelity.
  • Further research into regulatory complexes will refine our knowledge of centromere function.